R01UH0822EJ0100 Rev.1.00
Page 466 of 1041
Jul 31, 2019
RX13T Group
19. Multi-Function Timer Pulse Unit 3 (MTU3c)
19.3.12
Dead Time Compensation
A dead time delay (a propagation delay of the inverter output from the complementary PWM output) can be
compensated by combining MTU5 with MTU3 and MTU4.
shows an example of the motor control circuit
compensating a dead time delay by combining MTU5 with MTU3 and MTU4. A dead time for the PWM output
waveform during complementary PWM operation using MTU3 and MTU4 can be compensated by adjusting a duty ratio
set in a compare register for the PWM output after measuring a delay of the inverter output from the complementary
PWM output by an external pulse measurement function for MTU5 (
shows the procedure
for setting dead time compensation using MTU3 to MTU5. For details on MTU5 operation at this time, refer to
19.3.13, TCNTU, TCNTV, and TCNTW Capture at Crest and/or Trough in Complementary PWM Mode
.
Figure 19.94
Motor Control Circuit Example
Figure 19.95
Delay in Dead Time in Complementary PWM Operation
MTU
MTU5
Complementary
PWM output
Dead time
delay input
Inverter output
monitor signals
–
+
U#
V#
W#
U
V
W
U
V
W
Motor
Le
ve
l con
ver
si
on
DC
MTU3/
MTU4
Tdead
Tdelay
Upper arm signal (Positive-phase output)
Lower arm signal (Negative-phase output)
Inverter output detection signal
Dead time delay signal
(MTIC5U/MTIC5V/MTIC5W)